Igor Khatybov Khatybov
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| /** | |
| * Perms === permutations | |
| * Perm === permutation | |
| * */ | |
| /** | |
| * Find perms for string | |
| * It uses Johnson Trotter Algorithm | |
| * {@link https://en.wikipedia.org/wiki/Steinhaus–Johnson–Trotter_algorithm Wiki} | |
| * |